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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2010 Zhenya Leonov<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.palamida.util.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkArgument;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import static com.google.common.base.Preconditions.checkElementIndex;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import static com.google.common.base.Preconditions.checkPositionIndex;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import static com.google.common.base.Preconditions.checkPositionIndexes;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import static com.google.common.base.Preconditions.checkState;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.io.IOException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.io.NotSerializableException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.io.Serializable;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.AbstractCollection;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Collection;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Comparator;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.ConcurrentModificationException;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.Iterator;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.ListIterator;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.NoSuchElementException;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.PriorityQueue;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.Random;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import java.util.SortedSet;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>import com.google.common.collect.Iterables;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import com.google.common.collect.MinMaxPriorityQueue;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import com.google.common.collect.Ordering;<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>/**<a name="line.44"></a>
<span class="sourceLineNo">045</span> * A {@link Sortedlist} implementation based on a modified &lt;a<a name="line.45"></a>
<span class="sourceLineNo">046</span> * href="http://en.wikipedia.org/wiki/Skip_list"&gt;skip list&lt;/a&gt;. Elements are<a name="line.46"></a>
<span class="sourceLineNo">047</span> * sorted from &lt;i&gt;least&lt;/i&gt; to &lt;i&gt;greatest&lt;/i&gt; according to their &lt;i&gt;natural<a name="line.47"></a>
<span class="sourceLineNo">048</span> * ordering&lt;/i&gt;, or by an explicit {@link Comparator} provided at creation.<a name="line.48"></a>
<span class="sourceLineNo">049</span> * Attempting to remove or insert {@code null} elements is prohibited. Querying<a name="line.49"></a>
<span class="sourceLineNo">050</span> * for {@code null} elements is allowed. Inserting non-comparable elements will<a name="line.50"></a>
<span class="sourceLineNo">051</span> * result in a {@code ClassCastException}.<a name="line.51"></a>
<span class="sourceLineNo">052</span> * &lt;p&gt;<a name="line.52"></a>
<span class="sourceLineNo">053</span> * The underlying array-based &lt;a<a name="line.53"></a>
<span class="sourceLineNo">054</span> * href="http://en.wikipedia.org/wiki/Skip_list"&gt;skip list&lt;/a&gt; is modified to<a name="line.54"></a>
<span class="sourceLineNo">055</span> * provide logarithmic running time for insertion, removal, and &lt;a<a name="line.55"></a>
<span class="sourceLineNo">056</span> * href="http://en.wikipedia.org/wiki/Random_access"&gt;random access&lt;/a&gt; lookup<a name="line.56"></a>
<span class="sourceLineNo">057</span> * operations (e.g. get the element at the i&lt;i&gt;th&lt;/i&gt; index).<a name="line.57"></a>
<span class="sourceLineNo">058</span> * &lt;p&gt;<a name="line.58"></a>
<span class="sourceLineNo">059</span> * The iterators obtained from the {@link #iterator()} and<a name="line.59"></a>
<span class="sourceLineNo">060</span> * {@link #listIterator()} methods are &lt;i&gt;fail-fast&lt;/i&gt;. Attempts to modify the<a name="line.60"></a>
<span class="sourceLineNo">061</span> * elements in this sorted-list at any time after an iterator is created, in any<a name="line.61"></a>
<span class="sourceLineNo">062</span> * way except through the iterator's own remove method, will result in a<a name="line.62"></a>
<span class="sourceLineNo">063</span> * {@code ConcurrentModificationException}. Further, the list iterator does not<a name="line.63"></a>
<span class="sourceLineNo">064</span> * support the {@code add(E)} and {@code set(E)} operations.<a name="line.64"></a>
<span class="sourceLineNo">065</span> * &lt;p&gt;<a name="line.65"></a>
<span class="sourceLineNo">066</span> * This sorted-list is not &lt;i&gt;thread-safe&lt;/i&gt;. If multiple threads modify this<a name="line.66"></a>
<span class="sourceLineNo">067</span> * sorted-list concurrently it must be synchronized externally.<a name="line.67"></a>
<span class="sourceLineNo">068</span> * &lt;p&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span> * This implementation uses a comparator (whether or not one is explicitly<a name="line.69"></a>
<span class="sourceLineNo">070</span> * provided) to perform all element comparisons. Two elements which are deemed<a name="line.70"></a>
<span class="sourceLineNo">071</span> * equal by the comparator's {@code compare(E, E)} method are, from the<a name="line.71"></a>
<span class="sourceLineNo">072</span> * standpoint of this list, equal. Further, no guarantee is made as to the final<a name="line.72"></a>
<span class="sourceLineNo">073</span> * order of &lt;i&gt;equal&lt;/i&gt; elements. Ties may be broken arbitrarily.<a name="line.73"></a>
<span class="sourceLineNo">074</span> * &lt;p&gt;<a name="line.74"></a>
<span class="sourceLineNo">075</span> * Invented by &lt;a href="http://www.cs.umd.edu/~pugh/"&gt;Bill Pugh&lt;/a&gt; in 1990, A<a name="line.75"></a>
<span class="sourceLineNo">076</span> * skip list is a probabilistic data structure for maintaining items in sorted<a name="line.76"></a>
<span class="sourceLineNo">077</span> * order. Strictly speaking it is impossible to make any hard guarantees<a name="line.77"></a>
<span class="sourceLineNo">078</span> * regarding the worst-case performance of this class. Practical performance is<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;i&gt;expected&lt;/i&gt; to be logarithmic with an extremely high degree of<a name="line.79"></a>
<span class="sourceLineNo">080</span> * probability as the list grows.<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;p&gt;<a name="line.81"></a>
<span class="sourceLineNo">082</span> * The following table summarizes the performance of this class compared to a<a name="line.82"></a>
<span class="sourceLineNo">083</span> * {@link Treelist} (where n is the size of this sorted-list and &lt;i&gt;m&lt;/i&gt; is the<a name="line.83"></a>
<span class="sourceLineNo">084</span> * size of the specified collection which is iterable in linear time):<a name="line.84"></a>
<span class="sourceLineNo">085</span> * &lt;p&gt;<a name="line.85"></a>
<span class="sourceLineNo">086</span> * &lt;table border="1" cellpadding="3" cellspacing="1" style="width:400px;"&gt;<a name="line.86"></a>
<span class="sourceLineNo">087</span> *   &lt;tr&gt;<a name="line.87"></a>
<span class="sourceLineNo">088</span> *     &lt;th style="text-align:center;" rowspan="2"&gt;Method&lt;/th&gt;<a name="line.88"></a>
<span class="sourceLineNo">089</span> *     &lt;th style="text-align:center;" colspan="2"&gt;Running Time&lt;/th&gt;<a name="line.89"></a>
<span class="sourceLineNo">090</span> *   &lt;/tr&gt;<a name="line.90"></a>
<span class="sourceLineNo">091</span> *   &lt;tr&gt;<a name="line.91"></a>
<span class="sourceLineNo">092</span> *     &lt;td style="text-align:center;"&gt;&lt;b&gt;Skiplist&lt;/b&gt;&lt;br&gt;(&lt;i&gt;expected&lt;/i&gt;)&lt;/td&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span> *     &lt;td style="text-align:center;"&gt;&lt;b&gt;Treelist&lt;/b&gt;&lt;br&gt;(&lt;i&gt;worst-case&lt;/i&gt;)&lt;/td&gt;<a name="line.93"></a>
<span class="sourceLineNo">094</span> *   &lt;/tr&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span> *   &lt;tr&gt;<a name="line.95"></a>
<span class="sourceLineNo">096</span> *     &lt;td&gt;<a name="line.96"></a>
<span class="sourceLineNo">097</span> *       {@link #addAll(Collection) addAll(Collection)}&lt;br/&gt;<a name="line.97"></a>
<span class="sourceLineNo">098</span> *       {@link #containsAll(Collection) containsAll(Collection)}&lt;br/&gt;<a name="line.98"></a>
<span class="sourceLineNo">099</span> *       {@link #retainAll(Collection) retainAll(Collection)}&lt;br/&gt;<a name="line.99"></a>
<span class="sourceLineNo">100</span> *       {@link #removeAll(Collection) removeAll(Collection)}<a name="line.100"></a>
<span class="sourceLineNo">101</span> *     &lt;/td&gt;<a name="line.101"></a>
<span class="sourceLineNo">102</span> *     &lt;td style="text-align:center;" colspan="2"&gt;&lt;i&gt;O(m log n)&lt;/i&gt;&lt;/td&gt;<a name="line.102"></a>
<span class="sourceLineNo">103</span> *   &lt;/tr&gt;<a name="line.103"></a>
<span class="sourceLineNo">104</span> *   &lt;tr&gt;<a name="line.104"></a>
<span class="sourceLineNo">105</span> *     &lt;td&gt;<a name="line.105"></a>
<span class="sourceLineNo">106</span> *       {@link #indexOf(Object)}&lt;br/&gt;<a name="line.106"></a>
<span class="sourceLineNo">107</span> *       {@link #lastIndexOf(Object)}&lt;br/&gt;<a name="line.107"></a>
<span class="sourceLineNo">108</span> *       {@link #get(int)}&lt;br/&gt;<a name="line.108"></a>
<span class="sourceLineNo">109</span> *       {@link #remove(int)}&lt;br/&gt;<a name="line.109"></a>
<span class="sourceLineNo">110</span> *       {@link #listIterator(int)}<a name="line.110"></a>
<span class="sourceLineNo">111</span> *     &lt;/td&gt;<a name="line.111"></a>
<span class="sourceLineNo">112</span> *     &lt;td style="text-align:center;" bgcolor="FFCC99"&gt;&lt;i&gt;O(log n)&lt;/i&gt;&lt;/td&gt;<a name="line.112"></a>
<span class="sourceLineNo">113</span> *     &lt;td style="text-align:center;" bgcolor="FFCCCC"&gt;&lt;i&gt;O(n)&lt;/i&gt;&lt;/td&gt;<a name="line.113"></a>
<span class="sourceLineNo">114</span> *   &lt;/tr&gt;<a name="line.114"></a>
<span class="sourceLineNo">115</span> *   &lt;tr&gt;<a name="line.115"></a>
<span class="sourceLineNo">116</span> *     &lt;td&gt;<a name="line.116"></a>
<span class="sourceLineNo">117</span> *       {@link #add(Object) add(E)}&lt;br/&gt;<a name="line.117"></a>
<span class="sourceLineNo">118</span> *       {@link #contains(Object)}&lt;br/&gt;<a name="line.118"></a>
<span class="sourceLineNo">119</span> *       {@link #remove(Object)}<a name="line.119"></a>
<span class="sourceLineNo">120</span> *     &lt;/td&gt;<a name="line.120"></a>
<span class="sourceLineNo">121</span> *     &lt;td style="text-align:center;" colspan="2"&gt;&lt;i&gt;O(log n)&lt;/i&gt;&lt;/td&gt;<a name="line.121"></a>
<span class="sourceLineNo">122</span> *   &lt;/tr&gt;<a name="line.122"></a>
<span class="sourceLineNo">123</span> *   &lt;tr&gt;<a name="line.123"></a>
<span class="sourceLineNo">124</span> *     &lt;td&gt;<a name="line.124"></a>
<span class="sourceLineNo">125</span> *       {@link #clear() clear()}&lt;br/&gt;<a name="line.125"></a>
<span class="sourceLineNo">126</span> *       {@link #isEmpty() isEmpty()}&lt;br/&gt;<a name="line.126"></a>
<span class="sourceLineNo">127</span> *       {@link #size()}&lt;br/&gt;<a name="line.127"></a>
<span class="sourceLineNo">128</span> *     &lt;/td&gt;<a name="line.128"></a>
<span class="sourceLineNo">129</span> *     &lt;td style="text-align:center;" colspan="2"&gt;&lt;i&gt;O(1)&lt;/i&gt;&lt;/td&gt;<a name="line.129"></a>
<span class="sourceLineNo">130</span> *   &lt;/tr&gt;<a name="line.130"></a>
<span class="sourceLineNo">131</span> *   &lt;tr&gt;<a name="line.131"></a>
<span class="sourceLineNo">132</span> *     &lt;td&gt;<a name="line.132"></a>
<span class="sourceLineNo">133</span> *       {@link Iterator#remove()}&lt;br/&gt;<a name="line.133"></a>
<span class="sourceLineNo">134</span> *       {@link ListIterator#remove()}<a name="line.134"></a>
<span class="sourceLineNo">135</span> *     &lt;/td&gt;<a name="line.135"></a>
<span class="sourceLineNo">136</span> *     &lt;td style="text-align:center;" bgcolor="FFCC99"&gt;&lt;i&gt;O(log n)&lt;/i&gt;&lt;/td&gt;<a name="line.136"></a>
<span class="sourceLineNo">137</span> *     &lt;td style="text-align:center;" bgcolor="FFCCCC"&gt;&lt;i&gt;O(1)&lt;/i&gt;&lt;/td&gt;<a name="line.137"></a>
<span class="sourceLineNo">138</span> *   &lt;/tr&gt;<a name="line.138"></a>
<span class="sourceLineNo">139</span> * &lt;/table&gt;<a name="line.139"></a>
<span class="sourceLineNo">140</span> * &lt;p&gt;<a name="line.140"></a>
<span class="sourceLineNo">141</span> * The sub-list views exhibit identical time complexity, with the exception of<a name="line.141"></a>
<span class="sourceLineNo">142</span> * the {@code clear()} operation which runs in linear time proportional to the<a name="line.142"></a>
<span class="sourceLineNo">143</span> * size of the view.<a name="line.143"></a>
<span class="sourceLineNo">144</span> * <a name="line.144"></a>
<span class="sourceLineNo">145</span> * @author Zhenya Leonov<a name="line.145"></a>
<span class="sourceLineNo">146</span> * @param &lt;E&gt;<a name="line.146"></a>
<span class="sourceLineNo">147</span> *            the type of elements maintained by this list<a name="line.147"></a>
<span class="sourceLineNo">148</span> * @see Treelist<a name="line.148"></a>
<span class="sourceLineNo">149</span> */<a name="line.149"></a>
<span class="sourceLineNo">150</span>public class IndexableSkiplist&lt;E&gt; extends AbstractCollection&lt;E&gt; implements<a name="line.150"></a>
<span class="sourceLineNo">151</span>                Sortedlist&lt;E&gt;, Serializable, Cloneable {<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>        private static final long serialVersionUID = 1L;<a name="line.153"></a>
<span class="sourceLineNo">154</span>        private static final double P = .5;<a name="line.154"></a>
<span class="sourceLineNo">155</span>        private static final int MAX_LEVEL = 32;<a name="line.155"></a>
<span class="sourceLineNo">156</span>        transient int size = 0;<a name="line.156"></a>
<span class="sourceLineNo">157</span>        private transient int level = 1;<a name="line.157"></a>
<span class="sourceLineNo">158</span>        private transient Random random = new Random();<a name="line.158"></a>
<span class="sourceLineNo">159</span>        private transient Node&lt;E&gt; head = new Node&lt;E&gt;(null, MAX_LEVEL);<a name="line.159"></a>
<span class="sourceLineNo">160</span>        private final Comparator&lt;? super E&gt; comparator;<a name="line.160"></a>
<span class="sourceLineNo">161</span>        @SuppressWarnings("unchecked")<a name="line.161"></a>
<span class="sourceLineNo">162</span>        private transient Node&lt;E&gt;[] update = new Node[MAX_LEVEL];<a name="line.162"></a>
<span class="sourceLineNo">163</span>        private transient int[] index = new int[MAX_LEVEL];<a name="line.163"></a>
<span class="sourceLineNo">164</span>        transient int modCount = 0;<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>        private IndexableSkiplist(final Comparator&lt;? super E&gt; comparator) {<a name="line.166"></a>
<span class="sourceLineNo">167</span>                this.comparator = comparator;<a name="line.167"></a>
<span class="sourceLineNo">168</span>                for (int i = 0; i &lt; MAX_LEVEL; i++) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>                        head.next[i] = head;<a name="line.169"></a>
<span class="sourceLineNo">170</span>                        head.dist[i] = 1;<a name="line.170"></a>
<span class="sourceLineNo">171</span>                }<a name="line.171"></a>
<span class="sourceLineNo">172</span>                head.prev = head;<a name="line.172"></a>
<span class="sourceLineNo">173</span>        }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>        /**<a name="line.175"></a>
<span class="sourceLineNo">176</span>         * Creates a new {@code Skiplist} that orders its elements according to<a name="line.176"></a>
<span class="sourceLineNo">177</span>         * their &lt;i&gt;natural ordering&lt;/i&gt;.<a name="line.177"></a>
<span class="sourceLineNo">178</span>         * <a name="line.178"></a>
<span class="sourceLineNo">179</span>         * @return a new {@code Skiplist} that orders its elements according to<a name="line.179"></a>
<span class="sourceLineNo">180</span>         *         their &lt;i&gt;natural ordering&lt;/i&gt;<a name="line.180"></a>
<span class="sourceLineNo">181</span>         */<a name="line.181"></a>
<span class="sourceLineNo">182</span>        public static &lt;E extends Comparable&lt;? super E&gt;&gt; IndexableSkiplist&lt;E&gt; create() {<a name="line.182"></a>
<span class="sourceLineNo">183</span>                return new IndexableSkiplist&lt;E&gt;(Ordering.natural());<a name="line.183"></a>
<span class="sourceLineNo">184</span>        }<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>        /**<a name="line.186"></a>
<span class="sourceLineNo">187</span>         * Creates a new {@code Skiplist} containing the specified initial elements.<a name="line.187"></a>
<span class="sourceLineNo">188</span>         * If {@code elements} is an instance of {@link SortedSet},<a name="line.188"></a>
<span class="sourceLineNo">189</span>         * {@link PriorityQueue}, {@link MinMaxPriorityQueue}, or<a name="line.189"></a>
<span class="sourceLineNo">190</span>         * {@code SortedCollection}, this list will be ordered according to the same<a name="line.190"></a>
<span class="sourceLineNo">191</span>         * ordering. Otherwise, this list will be ordered according to the<a name="line.191"></a>
<span class="sourceLineNo">192</span>         * &lt;i&gt;natural ordering&lt;/i&gt; of its elements.<a name="line.192"></a>
<span class="sourceLineNo">193</span>         * <a name="line.193"></a>
<span class="sourceLineNo">194</span>         * @param elements<a name="line.194"></a>
<span class="sourceLineNo">195</span>         *            the collection whose elements are to be placed into the list<a name="line.195"></a>
<span class="sourceLineNo">196</span>         * @return a new {@code Skiplist} containing the elements of the specified<a name="line.196"></a>
<span class="sourceLineNo">197</span>         *         collection<a name="line.197"></a>
<span class="sourceLineNo">198</span>         * @throws ClassCastException<a name="line.198"></a>
<span class="sourceLineNo">199</span>         *             if elements of the specified collection cannot be compared to<a name="line.199"></a>
<span class="sourceLineNo">200</span>         *             one another according to this list's ordering<a name="line.200"></a>
<span class="sourceLineNo">201</span>         * @throws NullPointerException<a name="line.201"></a>
<span class="sourceLineNo">202</span>         *             if any of the elements of the specified collection or the<a name="line.202"></a>
<span class="sourceLineNo">203</span>         *             collection itself is {@code null}<a name="line.203"></a>
<span class="sourceLineNo">204</span>         */<a name="line.204"></a>
<span class="sourceLineNo">205</span>        @SuppressWarnings({ "unchecked" })<a name="line.205"></a>
<span class="sourceLineNo">206</span>        public static &lt;E&gt; IndexableSkiplist&lt;E&gt; from(final Collection&lt;? extends E&gt; elements) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>                checkNotNull(elements);<a name="line.207"></a>
<span class="sourceLineNo">208</span>                final Comparator&lt;? super E&gt; comparator;<a name="line.208"></a>
<span class="sourceLineNo">209</span>                if (elements instanceof SortedSet&lt;?&gt;)<a name="line.209"></a>
<span class="sourceLineNo">210</span>                        comparator = ((SortedSet&lt;? super E&gt;) elements).comparator();<a name="line.210"></a>
<span class="sourceLineNo">211</span>                else if (elements instanceof PriorityQueue&lt;?&gt;)<a name="line.211"></a>
<span class="sourceLineNo">212</span>                        comparator = ((PriorityQueue&lt;? super E&gt;) elements).comparator();<a name="line.212"></a>
<span class="sourceLineNo">213</span>                else if (elements instanceof SortedCollection&lt;?&gt;)<a name="line.213"></a>
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<span class="sourceLineNo">479</span>                        for (E e : this)<a name="line.479"></a>
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<span class="sourceLineNo">491</span>        public IndexableSkiplist&lt;E&gt; sublist(int fromIndex, int toIndex) {<a name="line.491"></a>
<span class="sourceLineNo">492</span>                checkPositionIndexes(fromIndex, toIndex, size);<a name="line.492"></a>
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<span class="sourceLineNo">496</span>        /**<a name="line.496"></a>
<span class="sourceLineNo">497</span>         * Returns a shallow copy of this {@code Skiplist}. The elements themselves<a name="line.497"></a>
<span class="sourceLineNo">498</span>         * are not cloned.<a name="line.498"></a>
<span class="sourceLineNo">499</span>         * <a name="line.499"></a>
<span class="sourceLineNo">500</span>         * @return a shallow copy of this skip list<a name="line.500"></a>
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<span class="sourceLineNo">503</span>        @Override<a name="line.503"></a>
<span class="sourceLineNo">504</span>        public IndexableSkiplist&lt;E&gt; clone() throws CloneNotSupportedException {<a name="line.504"></a>
<span class="sourceLineNo">505</span>                IndexableSkiplist&lt;E&gt; clone;<a name="line.505"></a>
<span class="sourceLineNo">506</span>                try {<a name="line.506"></a>
<span class="sourceLineNo">507</span>                        clone = (IndexableSkiplist&lt;E&gt;) super.clone();<a name="line.507"></a>
<span class="sourceLineNo">508</span>                } catch (java.lang.CloneNotSupportedException e) {<a name="line.508"></a>
<span class="sourceLineNo">509</span>                        throw new InternalError();<a name="line.509"></a>
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<span class="sourceLineNo">512</span>                        clone.head.next[i] = clone.head;<a name="line.512"></a>
<span class="sourceLineNo">513</span>                        clone.head.dist[i] = 1;<a name="line.513"></a>
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<span class="sourceLineNo">515</span>                clone.head.prev = clone.head;<a name="line.515"></a>
<span class="sourceLineNo">516</span>                clone.random = new Random();<a name="line.516"></a>
<span class="sourceLineNo">517</span>                clone.level = 1;<a name="line.517"></a>
<span class="sourceLineNo">518</span>                clone.modCount = 0;<a name="line.518"></a>
<span class="sourceLineNo">519</span>                clone.size = 0;<a name="line.519"></a>
<span class="sourceLineNo">520</span>                clone.addAll(this);<a name="line.520"></a>
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<span class="sourceLineNo">523</span><a name="line.523"></a>
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<span class="sourceLineNo">525</span>                        throws java.io.IOException {<a name="line.525"></a>
<span class="sourceLineNo">526</span>                oos.defaultWriteObject();<a name="line.526"></a>
<span class="sourceLineNo">527</span>                oos.writeInt(size);<a name="line.527"></a>
<span class="sourceLineNo">528</span>                for (E e : this)<a name="line.528"></a>
<span class="sourceLineNo">529</span>                        oos.writeObject(e);<a name="line.529"></a>
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<span class="sourceLineNo">533</span>        private void readObject(java.io.ObjectInputStream ois)<a name="line.533"></a>
<span class="sourceLineNo">534</span>                        throws java.io.IOException, ClassNotFoundException {<a name="line.534"></a>
<span class="sourceLineNo">535</span>                ois.defaultReadObject();<a name="line.535"></a>
<span class="sourceLineNo">536</span>                head = new Node&lt;E&gt;(null, MAX_LEVEL);<a name="line.536"></a>
<span class="sourceLineNo">537</span>                for (int i = 0; i &lt; MAX_LEVEL; i++) {<a name="line.537"></a>
<span class="sourceLineNo">538</span>                        head.next[i] = head;<a name="line.538"></a>
<span class="sourceLineNo">539</span>                        head.dist[i] = 1;<a name="line.539"></a>
<span class="sourceLineNo">540</span>                }<a name="line.540"></a>
<span class="sourceLineNo">541</span>                update = new Node[MAX_LEVEL];<a name="line.541"></a>
<span class="sourceLineNo">542</span>                index = new int[MAX_LEVEL];<a name="line.542"></a>
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<span class="sourceLineNo">544</span>                random = new Random();<a name="line.544"></a>
<span class="sourceLineNo">545</span>                level = 1;<a name="line.545"></a>
<span class="sourceLineNo">546</span>                int size = ois.readInt();<a name="line.546"></a>
<span class="sourceLineNo">547</span>                for (int i = 0; i &lt; size; i++)<a name="line.547"></a>
<span class="sourceLineNo">548</span>                        add((E) ois.readObject());<a name="line.548"></a>
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<span class="sourceLineNo">551</span>        private class ListIteratorImpl implements ListIterator&lt;E&gt; {<a name="line.551"></a>
<span class="sourceLineNo">552</span>                private Node&lt;E&gt; node;<a name="line.552"></a>
<span class="sourceLineNo">553</span>                private Node&lt;E&gt; last = null;<a name="line.553"></a>
<span class="sourceLineNo">554</span>                private final int offset;<a name="line.554"></a>
<span class="sourceLineNo">555</span>                private int index = 0;<a name="line.555"></a>
<span class="sourceLineNo">556</span>                private int expectedModCount = modCount;<a name="line.556"></a>
<span class="sourceLineNo">557</span><a name="line.557"></a>
<span class="sourceLineNo">558</span>                private ListIteratorImpl(final int index) {<a name="line.558"></a>
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<span class="sourceLineNo">560</span>                        offset = index;<a name="line.560"></a>
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<span class="sourceLineNo">562</span><a name="line.562"></a>
<span class="sourceLineNo">563</span>                @Override<a name="line.563"></a>
<span class="sourceLineNo">564</span>                public void add(E element) {<a name="line.564"></a>
<span class="sourceLineNo">565</span>                        throw new UnsupportedOperationException();<a name="line.565"></a>
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<span class="sourceLineNo">568</span>                @Override<a name="line.568"></a>
<span class="sourceLineNo">569</span>                public boolean hasNext() {<a name="line.569"></a>
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<span class="sourceLineNo">572</span><a name="line.572"></a>
<span class="sourceLineNo">573</span>                @Override<a name="line.573"></a>
<span class="sourceLineNo">574</span>                public boolean hasPrevious() {<a name="line.574"></a>
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<span class="sourceLineNo">577</span><a name="line.577"></a>
<span class="sourceLineNo">578</span>                @Override<a name="line.578"></a>
<span class="sourceLineNo">579</span>                public E next() {<a name="line.579"></a>
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<span class="sourceLineNo">582</span>                                throw new NoSuchElementException();<a name="line.582"></a>
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<span class="sourceLineNo">584</span>                        last = node;<a name="line.584"></a>
<span class="sourceLineNo">585</span>                        node = node.next();<a name="line.585"></a>
<span class="sourceLineNo">586</span>                        return last.element;<a name="line.586"></a>
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<span class="sourceLineNo">588</span><a name="line.588"></a>
<span class="sourceLineNo">589</span>                @Override<a name="line.589"></a>
<span class="sourceLineNo">590</span>                public int nextIndex() {<a name="line.590"></a>
<span class="sourceLineNo">591</span>                        return index + offset;<a name="line.591"></a>
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<span class="sourceLineNo">593</span><a name="line.593"></a>
<span class="sourceLineNo">594</span>                @Override<a name="line.594"></a>
<span class="sourceLineNo">595</span>                public E previous() {<a name="line.595"></a>
<span class="sourceLineNo">596</span>                        checkForConcurrentModification();<a name="line.596"></a>
<span class="sourceLineNo">597</span>                        if (index == 0)<a name="line.597"></a>
<span class="sourceLineNo">598</span>                                throw new NoSuchElementException();<a name="line.598"></a>
<span class="sourceLineNo">599</span>                        index--;<a name="line.599"></a>
<span class="sourceLineNo">600</span>                        last = node = node.prev;<a name="line.600"></a>
<span class="sourceLineNo">601</span>                        return node.element;<a name="line.601"></a>
<span class="sourceLineNo">602</span>                }<a name="line.602"></a>
<span class="sourceLineNo">603</span><a name="line.603"></a>
<span class="sourceLineNo">604</span>                @Override<a name="line.604"></a>
<span class="sourceLineNo">605</span>                public int previousIndex() {<a name="line.605"></a>
<span class="sourceLineNo">606</span>                        return index + offset - 1;<a name="line.606"></a>
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<span class="sourceLineNo">608</span><a name="line.608"></a>
<span class="sourceLineNo">609</span>                @Override<a name="line.609"></a>
<span class="sourceLineNo">610</span>                public void remove() {<a name="line.610"></a>
<span class="sourceLineNo">611</span>                        checkForConcurrentModification();<a name="line.611"></a>
<span class="sourceLineNo">612</span>                        checkState(last != null);<a name="line.612"></a>
<span class="sourceLineNo">613</span>                        IndexableSkiplist.this.remove(--index + offset);<a name="line.613"></a>
<span class="sourceLineNo">614</span>                        expectedModCount = modCount;<a name="line.614"></a>
<span class="sourceLineNo">615</span>                        last = null;<a name="line.615"></a>
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<span class="sourceLineNo">617</span><a name="line.617"></a>
<span class="sourceLineNo">618</span>                @Override<a name="line.618"></a>
<span class="sourceLineNo">619</span>                public void set(E element) {<a name="line.619"></a>
<span class="sourceLineNo">620</span>                        throw new UnsupportedOperationException();<a name="line.620"></a>
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<span class="sourceLineNo">622</span><a name="line.622"></a>
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<span class="sourceLineNo">624</span>                        if (expectedModCount != modCount)<a name="line.624"></a>
<span class="sourceLineNo">625</span>                                throw new ConcurrentModificationException();<a name="line.625"></a>
<span class="sourceLineNo">626</span>                }<a name="line.626"></a>
<span class="sourceLineNo">627</span>        }<a name="line.627"></a>
<span class="sourceLineNo">628</span><a name="line.628"></a>
<span class="sourceLineNo">629</span>        // skip list<a name="line.629"></a>
<span class="sourceLineNo">630</span><a name="line.630"></a>
<span class="sourceLineNo">631</span>        private static class Node&lt;E&gt; {<a name="line.631"></a>
<span class="sourceLineNo">632</span>                private E element;<a name="line.632"></a>
<span class="sourceLineNo">633</span>                private Node&lt;E&gt; prev;<a name="line.633"></a>
<span class="sourceLineNo">634</span>                private final Node&lt;E&gt;[] next;<a name="line.634"></a>
<span class="sourceLineNo">635</span>                private final int[] dist;<a name="line.635"></a>
<span class="sourceLineNo">636</span><a name="line.636"></a>
<span class="sourceLineNo">637</span>                @SuppressWarnings("unchecked")<a name="line.637"></a>
<span class="sourceLineNo">638</span>                private Node(final E element, final int size) {<a name="line.638"></a>
<span class="sourceLineNo">639</span>                        this.element = element;<a name="line.639"></a>
<span class="sourceLineNo">640</span>                        next = new Node[size];<a name="line.640"></a>
<span class="sourceLineNo">641</span>                        dist = new int[size];<a name="line.641"></a>
<span class="sourceLineNo">642</span>                }<a name="line.642"></a>
<span class="sourceLineNo">643</span><a name="line.643"></a>
<span class="sourceLineNo">644</span>                private Node&lt;E&gt; next() {<a name="line.644"></a>
<span class="sourceLineNo">645</span>                        return next[0];<a name="line.645"></a>
<span class="sourceLineNo">646</span>                }<a name="line.646"></a>
<span class="sourceLineNo">647</span>        }<a name="line.647"></a>
<span class="sourceLineNo">648</span><a name="line.648"></a>
<span class="sourceLineNo">649</span>        private int randomLevel() {<a name="line.649"></a>
<span class="sourceLineNo">650</span>                int randomLevel = 1;<a name="line.650"></a>
<span class="sourceLineNo">651</span>                while (randomLevel &lt; MAX_LEVEL - 1 &amp;&amp; random.nextDouble() &lt; P)<a name="line.651"></a>
<span class="sourceLineNo">652</span>                        randomLevel++;<a name="line.652"></a>
<span class="sourceLineNo">653</span>                return randomLevel;<a name="line.653"></a>
<span class="sourceLineNo">654</span>        }<a name="line.654"></a>
<span class="sourceLineNo">655</span><a name="line.655"></a>
<span class="sourceLineNo">656</span>        private boolean remove(final Node&lt;E&gt; node) {<a name="line.656"></a>
<span class="sourceLineNo">657</span>                Node&lt;E&gt; curr = head;<a name="line.657"></a>
<span class="sourceLineNo">658</span>                for (int i = level - 1; i &gt;= 0; i--) {<a name="line.658"></a>
<span class="sourceLineNo">659</span>                        while (curr.next[i] != head &amp;&amp; curr.next[i] != node)<a name="line.659"></a>
<span class="sourceLineNo">660</span>                                curr = curr.next[i];<a name="line.660"></a>
<span class="sourceLineNo">661</span>                        update[i] = curr;<a name="line.661"></a>
<span class="sourceLineNo">662</span>                }<a name="line.662"></a>
<span class="sourceLineNo">663</span>                curr = curr.next();<a name="line.663"></a>
<span class="sourceLineNo">664</span>                delete(curr, update);<a name="line.664"></a>
<span class="sourceLineNo">665</span>                return true;<a name="line.665"></a>
<span class="sourceLineNo">666</span>        }<a name="line.666"></a>
<span class="sourceLineNo">667</span><a name="line.667"></a>
<span class="sourceLineNo">668</span>        private void delete(final Node&lt;E&gt; node, final Node&lt;E&gt;[] update) {<a name="line.668"></a>
<span class="sourceLineNo">669</span>                for (int i = 0; i &lt; level; i++)<a name="line.669"></a>
<span class="sourceLineNo">670</span>                        if (update[i].next[i] == node) {<a name="line.670"></a>
<span class="sourceLineNo">671</span>                                update[i].next[i] = node.next[i];<a name="line.671"></a>
<span class="sourceLineNo">672</span>                                update[i].dist[i] += node.dist[i] - 1;<a name="line.672"></a>
<span class="sourceLineNo">673</span>                        } else<a name="line.673"></a>
<span class="sourceLineNo">674</span>                                update[i].dist[i]--;<a name="line.674"></a>
<span class="sourceLineNo">675</span>                node.next().prev = node.prev;<a name="line.675"></a>
<span class="sourceLineNo">676</span>                while (head.next[level - 1] == head &amp;&amp; level &gt; 1)<a name="line.676"></a>
<span class="sourceLineNo">677</span>                        level--;<a name="line.677"></a>
<span class="sourceLineNo">678</span>                modCount++;<a name="line.678"></a>
<span class="sourceLineNo">679</span>                size--;<a name="line.679"></a>
<span class="sourceLineNo">680</span>        }<a name="line.680"></a>
<span class="sourceLineNo">681</span><a name="line.681"></a>
<span class="sourceLineNo">682</span>        Node&lt;E&gt; search(final E element) {<a name="line.682"></a>
<span class="sourceLineNo">683</span>                Node&lt;E&gt; curr = head;<a name="line.683"></a>
<span class="sourceLineNo">684</span>                for (int i = level - 1; i &gt;= 0; i--)<a name="line.684"></a>
<span class="sourceLineNo">685</span>                        while (curr.next[i] != head<a name="line.685"></a>
<span class="sourceLineNo">686</span>                                        &amp;&amp; comparator.compare(curr.next[i].element, element) &lt; 0)<a name="line.686"></a>
<span class="sourceLineNo">687</span>                                curr = curr.next[i];<a name="line.687"></a>
<span class="sourceLineNo">688</span>                curr = curr.next();<a name="line.688"></a>
<span class="sourceLineNo">689</span>                if (curr != head &amp;&amp; comparator.compare(curr.element, element) == 0)<a name="line.689"></a>
<span class="sourceLineNo">690</span>                        return curr;<a name="line.690"></a>
<span class="sourceLineNo">691</span>                return null;<a name="line.691"></a>
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<span class="sourceLineNo">693</span><a name="line.693"></a>
<span class="sourceLineNo">694</span>        private Node&lt;E&gt; search(final int index) {<a name="line.694"></a>
<span class="sourceLineNo">695</span>                Node&lt;E&gt; curr = head;<a name="line.695"></a>
<span class="sourceLineNo">696</span>                int idx = -1;<a name="line.696"></a>
<span class="sourceLineNo">697</span>                for (int i = level - 1; i &gt;= 0; i--)<a name="line.697"></a>
<span class="sourceLineNo">698</span>                        while (idx + curr.dist[i] &lt;= index) {<a name="line.698"></a>
<span class="sourceLineNo">699</span>                                idx += curr.dist[i];<a name="line.699"></a>
<span class="sourceLineNo">700</span>                                curr = curr.next[i];<a name="line.700"></a>
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<span class="sourceLineNo">702</span>                return curr;<a name="line.702"></a>
<span class="sourceLineNo">703</span>        }<a name="line.703"></a>
<span class="sourceLineNo">704</span><a name="line.704"></a>
<span class="sourceLineNo">705</span>        @SuppressWarnings("serial")<a name="line.705"></a>
<span class="sourceLineNo">706</span>        private final class Sublist extends IndexableSkiplist&lt;E&gt; {<a name="line.706"></a>
<span class="sourceLineNo">707</span>                private final IndexableSkiplist&lt;E&gt; list;<a name="line.707"></a>
<span class="sourceLineNo">708</span>                private int offset;<a name="line.708"></a>
<span class="sourceLineNo">709</span>                private Node&lt;E&gt; from;<a name="line.709"></a>
<span class="sourceLineNo">710</span>                private Node&lt;E&gt; to;<a name="line.710"></a>
<span class="sourceLineNo">711</span><a name="line.711"></a>
<span class="sourceLineNo">712</span>                public Sublist(final IndexableSkiplist&lt;E&gt; list, final int fromIndex,<a name="line.712"></a>
<span class="sourceLineNo">713</span>                                final int toIndex) {<a name="line.713"></a>
<span class="sourceLineNo">714</span>                        super(list.comparator);<a name="line.714"></a>
<span class="sourceLineNo">715</span>                        this.list = list;<a name="line.715"></a>
<span class="sourceLineNo">716</span>                        this.modCount = list.modCount;<a name="line.716"></a>
<span class="sourceLineNo">717</span>                        offset = fromIndex;<a name="line.717"></a>
<span class="sourceLineNo">718</span>                        this.size = toIndex - fromIndex;<a name="line.718"></a>
<span class="sourceLineNo">719</span>                        from = list.search(fromIndex);<a name="line.719"></a>
<span class="sourceLineNo">720</span>                        to = list.search(toIndex - 1);<a name="line.720"></a>
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